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import * as dom from 'shared/utils/dom';
const modifierdKeyName = (name) => {
if (name.length === 1) {
return name.toUpperCase();
} else if (name === 'Escape') {
return 'Esc';
}
return name;
};
const mapKey = (e) => {
if (e.ctrlKey) {
return '<C-' + modifierdKeyName(e.key) + '>';
} else if (e.shiftKey && e.key.length !== 1) {
return '<S-' + modifierdKeyName(e.key) + '>';
}
return e.key;
};
export default class InputComponent {
constructor(target) {
this.pressed = {};
this.onKeyListeners = [];
target.addEventListener('keypress', this.onKeyPress.bind(this));
target.addEventListener('keydown', this.onKeyDown.bind(this));
target.addEventListener('keyup', this.onKeyUp.bind(this));
}
onKey(cb) {
this.onKeyListeners.push(cb);
}
onKeyPress(e) {
if (this.pressed[e.key] && this.pressed[e.key] !== 'keypress') {
return;
}
this.pressed[e.key] = 'keypress';
this.capture(e);
}
onKeyDown(e) {
if (this.pressed[e.key] && this.pressed[e.key] !== 'keydown') {
return;
}
this.pressed[e.key] = 'keydown';
this.capture(e);
}
onKeyUp(e) {
delete this.pressed[e.key];
}
capture(e) {
if (this.fromInput(e)) {
if (e.key === 'Escape' && e.target.blur) {
e.target.blur();
}
return;
}
if (['Shift', 'Control', 'Alt', 'OS'].includes(e.key)) {
// pressing only meta key is ignored
return;
}
let key = mapKey(e);
for (let listener of this.onKeyListeners) {
let stop = listener(key);
if (stop) {
e.preventDefault();
e.stopPropagation();
break;
}
}
}
fromInput(e) {
if (!e.target) {
return false;
}
return e.target instanceof HTMLInputElement ||
e.target instanceof HTMLTextAreaElement ||
e.target instanceof HTMLSelectElement ||
dom.isContentEditable(e.target);
}
}
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